[Tests] add npm run posttest

Author: ljharb

package.json

@@ -20,7 +20,8 @@
     "lint": "eslint --ext=js,mjs .",
     "tests-only": "nyc tape 'test/**/*.js'",
     "pretest": "npm run lint",
-    "test": "npm run tests-only"
+    "test": "npm run tests-only",
+	"posttest": "aud --production"
   },
   "dependencies": {
     "bn.js": "^5.2.1",
@@ -35,6 +36,7 @@
   },
   "devDependencies": {
     "@ljharb/eslint-config": "^21.1.0",
+    "aud": "^2.0.3",
     "eslint": "=8.8.0",
     "nyc": "^10.3.2",
     "tape": "^5.6.6"